Investments - Summary of Transactions with Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Amounts due from affiliates	$ 10.3	$ 16.2
Amounts due to affiliates	1.0	4.1
BRI
Related Party Transaction [Line Items]
Amounts due from affiliates	4.7	3.3
Amounts due to affiliates	(0.3)	0.4
BDL
Related Party Transaction [Line Items]
Amounts due from affiliates	0.2	6.2
Amounts due to affiliates	0.0	3.1
Other
Related Party Transaction [Line Items]
Amounts due from affiliates	5.4	6.7
Amounts due to affiliates	$ 1.3	$ 0.6